Were your parents mean with you when you lived with them, or is it just the knowledge of their savings, which you feel could have been used to help you, which rankles?
It is their money; they are the generation which could not spend, having been through the Depression, and you don't really have any right to expect them to use their savings. Probably they are holding on to their money to pay for their old age, which is precisely what my father did, and the whole considerable sum was swallowed in care home fees. I don't feel bitter; it was his money to spend how he chose, but I do grudge the fact that he could have given my mother a better, more comfortable life.